With just a few drops of this powerful and lightweight serum, hair’s strength and density will be increased. Pro-vitamins B5 and B6 combined with a tyrosine derivative prevent future damage and boost the level of melanin in each hair shaft, delaying the appearance of gray hair.A powerful leave-in that counters the first signs of fiber aging: fiber porosity, loss of density & graying. Phytodensium Age-Defying Serum for Lifeless Hair is an anti-aging serum that is sulphate, silicone and paraben free and 100% fragrance free.